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Dreamcast - Sega GT Homologation Special cheats

WSK Races and 1sxt ending:
Finish every official races and event races.
The WSK races include the Front, Rear and 4 wheek Drive Car Cups.

Unlimited money
Note: You need two VMU to do this trick. Save the game on both VMUs. 
Transfer the earned cars from VMU 1 to VMU 2. Load back the game 
from the VMU with the bonuse cars. Sell all the bonus cars.
Repeat as many times you want.